Glass fiber sizing composition

Abstract

A glass fiber sizing composition comprising a phenolic epoxy resin; the reaction product of a partial ester of a polycarboxylic acid which contains one or more unesterified carboxyl groups with a compound containing more than one epoxy group; a glass fiber lubricant; sufficient emulsifiers to impart a homogeneous mixture; a saturated fatty triglyceride; a silane coupling agent and a major amount of water. Glass fibers sized in accordance with the invention exhibit excellent reinforcing characteristics.

I claim: 
     
       1. A glass fiber sizing composition comprising a phenolic epoxy resin; the reaction product of a partial ester of a polycarboxylic acid containing 1 or more unesterified carboxyl group with a compound containing more than one epoxy group; a dual emulsifier system; one emulsifier being a polyethylene glycol, the second emulsifier consisting essentially of the reaction product of propylene glycol and ethylene oxide; a saturated fatty triglyceride; and a silane coupling agent. 
     
     
       2. The sizing composition of claim 1 wherein said reaction product of the partial ester of a polycarboxylic acid containing one or more unesterified carboxyl group with a compound containing more than one epoxy group consists essentially of reaction product of maleic anhydride, a monomethyletherpolyethylene glycol having a molecular weight of about 750 and 3,4 epoxy cyclohexylmethyl 3,4 epoxy cyclohexane carboxylate. 
     
     
       3. The sizing composition of claim 1 wherein said saturated fatty triglyceride is hydrogenated corn oil. 
     
     
       4. The sizing composition of claim 1 wherein said coupling agent is methacryloxypropyltrimethoxysilane. 
     
     
       5. The sizing composition of claim 1 wherein said silane coupling agent is glycidoxypropyltrimethoxysilane. 
     
     
       6. Glass fibers having thereon the sizing composition of claim 1.